饱和淤泥质砂土动力变形及动强度特性试验研究

发布时间：2018-03-02 00:05

本文关键词： 土力学淤泥质砂土动三轴试验固结应力比动应力动应变泥砂比例　出处：《岩石力学与工程学报》2014年S1期 　论文类型：期刊论文

【摘要】：为研究淤泥质砂土的动力特性,利用动三轴仪对现场饱和淤泥质砂土进行不同固结应力状态下(固结围压σ3c=100,200,300,400 kPa,固结应力比Kc=1.0,1.5,2.0)的动力变形特性及动强度特性试验研究。分析动应力动应变关系,阻尼比、动强度等一系列变化规律,并对淤泥与砂含量比例对淤泥质砂土动力特性的影响进行初步探索。研究结果表明:固结应力状态对饱和淤泥质砂土动应力动应变关系影响很大;阻尼比随动应变的增大而增大,相同固结围压下,阻尼比随固结应力比的增大而增大;不同固结应力状态下,动应力随破坏振次的增大而降低,相同固结应力比,不同固结围压下σd/(2σ3c)与fN关系可以近似归一;不同的淤泥含量对饱和淤泥质砂土的动力特性影响显著,在相同的动应变条件下,动应力随着淤泥含量的增大而减小;在相同的固结围压下,阻尼比随着淤泥含量的增大而增大;强度并不是随着淤泥含量的增加而单调增加,在淤泥含量为20%时强度最低。
[Abstract]:In order to study the dynamic characteristics of silt sandy soil, The dynamic deformation characteristics and dynamic strength characteristics of saturated silt sand under different consolidation stress states (consolidation confining pressure 蟽 3c / 100 / 200m 300kPa, consolidation stress ratio KcS1.0 / 1.52.0) are studied by using dynamic triaxial apparatus. The dynamic stress strain relationship and damping ratio are analyzed, and the dynamic deformation and dynamic strength characteristics of the saturated silt sand are studied by using the dynamic triaxial apparatus. The dynamic deformation and dynamic strength characteristics of the saturated silt sand are studied by means of the dynamic triaxial apparatus. A series of laws of change, such as dynamic strength, The effect of the ratio of silt to sand content on the dynamic characteristics of silt sandy soil is studied. The results show that the consolidation stress state has a great influence on the dynamic stress and strain relationship of saturated silty sand. The damping ratio increases with the increase of dynamic strain, and increases with the increase of consolidation stress ratio under the same consolidation confining pressure. Under different consolidation pressures, the relationship between 蟽 _ d _ (2) 蟽 _ (3) c) and fN can be approximately normalized, and the dynamic stress decreases with the increase of silt content, and the dynamic characteristics of saturated silt sand are significantly affected by different silt content. Under the same consolidation confining pressure, the damping ratio increases with the increase of silt content, and the strength does not increase monotonously with the increase of silt content, and the strength is the lowest when the silt content is 20.
【作者单位】：西安理工大学岩土工程研究所;
【分类号】：TU411

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